论文标题
关于潜在可无视假设的合理性
On the plausibility of the latent ignorability assumption
论文作者
论文摘要
基于仪器变量（IV）的内源治疗的因果效应的估计通常会因感兴趣的结果而变得复杂，样品选择或无反应。为了解决后一个问题，潜在的无视性（LI）假设施加了损耗/样本选择独立于治疗依从性类型的条件（即治疗与仪器的函数），仪器以及可能进一步观察到的协变量。作为一个谨慎的措施，本说明正式讨论了LI在相当标准的IV模型中的强烈行为含义。我们还基于工作兵团实验研究提供了经验例证，其中研究了估计的程序对LI的敏感性以及对结果损耗的替代假设的敏感性。
The estimation of the causal effect of an endogenous treatment based on an instrumental variable (IV) is often complicated by attrition, sample selection, or non-response in the outcome of interest. To tackle the latter problem, the latent ignorability (LI) assumption imposes that attrition/sample selection is independent of the outcome conditional on the treatment compliance type (i.e. how the treatment behaves as a function of the instrument), the instrument, and possibly further observed covariates. As a word of caution, this note formally discusses the strong behavioral implications of LI in rather standard IV models. We also provide an empirical illustration based on the Job Corps experimental study, in which the sensitivity of the estimated program effect to LI and alternative assumptions about outcome attrition is investigated.
